Base Difficulty

Base difficulty: Level 456 edit

Level distribution for noun (quantitative_concept): 20: 1 26: 1 162: 20 276: 22 380: 20 390: 1 456: 1 460: 1 1000: 1 1050: 2 1070: 2 1080: 5 1090: 1 1110: 1 1120: 1 1202: 2 1203: 1 1204: 2 1206: 1 1210: 2 1211: 1 1213: 7 1218: 1 1225: 2 1226: 1 1399: 21

Per-Language Difficulty Overrides

No difficulty overrides set. The base difficulty level will be used for all languages.

Add Difficulty Override
-1 to exclude, 1-1399 for level
Frequency and Tier Signals
Combined Frequency Rank: 3963 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
cefr B2 (4 of 6) 6900

Rank used = synthetic rank this tier contributes to the combined frequency rank (lower = more common).

Corpus Frequency
Corpus Freq (per M) Best form Share Zipf rank Forms
19th_books 5.08 6454 50% 12908 downrated 1
20th_books 2.73 9394 50% 18788 downrated 1
wiki_math 150.13 627 50% 872 downrated 2
wiki_geography 61.87 1857 50% 2246 downrated 2
wiki_biology 48.17 2249 50% 2764 downrated 2
wiki_modern_life 34.67 3949 50% 4004 downrated 2
wiki_arts 0.00 — — — 0
wiki_society 36.78 3400 50% 3708 downrated 2
wiki_linguistics 39.50 2277 50% 2852 downrated 2
wiki_physical_science 84.09 1572 50% 1717 downrated 2
wiki_history 34.96 3346 50% 3772 downrated 2
early_modern_science 25.25 2191 50% 4382 downrated 1
religious_translated 0.00 — — — 0
cooking 0.00 — — — 0
legal_scotus 23.68 3480 50% 4084 downrated 2
eu_parliament_debates 20.40 3019 50% 3768 downrated 2
openstax_science 80.00 1143 50% 1694 downrated 2
openstax_society 34.31 3118 50% 3504 downrated 2
wpa_life_histories 3.25 8850 50% 17700 downrated 1

Best form = the single best-ranked form in the corpus, share-blind — how the spelling itself ranked. Share = how much of that spelling belongs to this lemma, when several senses compete for it. Zipf rank = all the forms combined (variant spellings included), each scaled by its share, and what feeds the combined frequency rank. Combining forms improves on the best form, but a share below 100% pushes the other way and usually wins: a sense holding a small slice of a common spelling is a rare word, so its rank lands downrated below the best form — and once it falls past what the corpus can support it is capped at the rank an unlisted word would get.